﻿using EU.Core.Common.Https.HttpPolly;
using EU.Core.Model;
using Microsoft.Extensions.DependencyInjection;
using Polly;
using Polly.Extensions.Http;
using Polly.Timeout;

namespace EU.Core.Extensions;

/// <summary>
/// Cors 启动服务
/// </summary>
public static class HttpPollySetup
{
    public static void AddHttpPollySetup(this IServiceCollection services)
    {
        if (services == null) throw new ArgumentNullException(nameof(services));

        #region Polly策略
        var retryPolicy = HttpPolicyExtensions
        .HandleTransientHttpError()
        .Or<TimeoutRejectedException>() // 若超时则抛出此异常
        .WaitAndRetryAsync(new[]
        {
            TimeSpan.FromSeconds(1),
            TimeSpan.FromSeconds(5),
            TimeSpan.FromSeconds(10)
        });

        // 为每个重试定义超时策略
        var timeoutPolicy = Policy.TimeoutAsync<HttpResponseMessage>(10);
        #endregion

        services.AddHttpClient(HttpEnum.Common.ToString(), c =>
        {
            c.DefaultRequestHeaders.Add("Accept", "application/json");
        })
        .AddPolicyHandler(retryPolicy)
        // 将超时策略放在重试策略之内，每次重试会应用此超时策略
        .AddPolicyHandler(timeoutPolicy);

        services.AddHttpClient(HttpEnum.LocalHost.ToString(), c =>
        {
            c.BaseAddress = new Uri("http://www.localhost.com");
            c.DefaultRequestHeaders.Add("Accept", "application/json");
        })
        .AddPolicyHandler(retryPolicy)
        // 将超时策略放在重试策略之内，每次重试会应用此超时策略
        .AddPolicyHandler(timeoutPolicy);

        services.AddSingleton<IHttpPollyHelper, HttpPollyHelper>();
    }
}
